Hey! 

It would also be really helpful if you could assign a different pretty url for
each main category.

An example: 
I have five languages with three sports each. I need event calendars for each
language and each sport. That makes 5 main categories (if it would be possible
to make main and sub categories) with three subcategories each.

Now I would really need five different url:s, as it is quite confusing if all
categories and subcategories uses the same pretty url (even if they exist in
different locations).

A solution to this would be a real lifesaver for me! 
Thank you, Thomas.